Claude Opus 5.5 is Anthropic's flagship model for agentic coding, computer use, complex knowledge work, and long-running tasks, with improved efficiency and more natural communication.
Added Sep 22, 2026
Context Window
1.0M
Max Output
128.0K
Input Price (Auto)
$4.00/1M
Output Price (Auto)
$20.00/1M
Cache Read (Auto)
$0.20/1M
Capabilities
Benchmarks
Benchmarks
Performance metrics and benchmarks
Sourced from Artificial Analysis.
Intelligence Index
57.6
Agentic work
AutomationBench-AA
Workflow automation with guardrail penalties
69.5%
Better than 99% of models compared
AutomationBench-AA Tasks Completed
Fully completed workflows without guardrail violations
41.2%
Better than 94% of models compared
Harvey LAB-AA
Legal agentic work criterion pass rate
91.2%
Better than 73% of models compared
AA-Briefcase
Agentic knowledge work (Elo)
1822 Elo
Better than 99% of models compared
GDPval-AA v2
Economically valuable tasks (Elo)
1846 Elo
Better than 99% of models compared
Document reasoning
GDP.pdf
Professional PDF reasoning: all-pass rate
26.2%
Better than 90% of models compared
AA-LCR v1.1
Long context reasoning with updated grading
84.7%
Better than 99% of models compared
Reasoning
HLE
Humanity's Last Exam
61.4%
Better than 99% of models compared
Coding
Terminal-Bench v4.0
Practical coding and terminal tasks
59.6%
Better than 99% of models compared
SciCode
Python programming for scientific computing
66.9%
Better than 99% of models compared
Legacy benchmarks
AA-LCR (unversioned / legacy)
Long context reasoning evaluation
84.7%
Better than 99% of models compared
Last updated Sep 22, 2026
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